Kitchen scale and cannon: what they have in common

1. Step 1. Kitchen scale — has part — Spring. The load stretches a spring.
2. Step 2. Spring — is part of — Flintlock. A mainspring.
3. Step 3. Flintlock — is part of — Musket. A flintlock.
4. Step 4. Musket — evolved from — Hand cannon. A hand-held gun.
5. Step 5. Hand cannon — evolved into — Cannon. A large hand cannon.

Open Evothings